Xen Install

Xen : Install 2016/01/25

	Install Xen to build Virtualization Environment.
[1]	Enable CentOS Xen Repository and install some packgaes.

[root@dlp ~]#  yum -y install centos-release-xen [root@dlp ~]#  sed -i -e "s/enabled=1/enabled=0/g" /etc/yum.repos.d/CentOS-Xen.repo  [root@dlp ~]#  yum --enablerepo=centos-virt-xen -y update kernel [root@dlp ~]#  yum --enablerepo=centos-virt-xen -y install xen [root@dlp ~]#  vi /etc/default/grub # change memory amount for Domain0 (specify proper value on your system) GRUB_CMDLINE_XEN_DEFAULT="dom0_mem= 4096M ,max: 4096M  cpuinfo com1=115200,8n1 ..... [root@dlp ~]#  /bin/grub-bootxen.sh  [root@dlp ~]#  reboot # display info [root@dlp ~]#  xl info  host : dlp.server.world release : 3.18.21-17.el7.x86_64 version : #1 SMP Fri Dec 18 18:04:14 UTC 2015 machine : x86_64 nr_cpus : 6 max_cpu_id : 5 nr_nodes : 1 cores_per_socket : 1 threads_per_core : 1 cpu_mhz : 2594 hw_caps : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx virt_caps : hvm total_memory : 12287 free_memory : 8054 sharing_freed_memory : 0 sharing_used_memory : 0 outstanding_claims : 0 free_cpus : 0 xen_major : 4 xen_minor : 6 xen_extra : .0-9.el7 xen_version : 4.6.0-9.el7 xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_scheduler : credit xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : Thu Jan 14 15:35:35 2016 +0000 git:6e8597a-dirty xen_commandline : placeholder dom0_mem=4096M,max:4096M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all cc_compiler : gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4) cc_compile_by : mockbuild cc_compile_domain : centos.org cc_compile_date : Wed Jan 20 12:25:53 UTC 2016 xend_config_format : 4

[2]	Configure Bridge networking for KVM virtual machine. Replace the interface name "eno16777736" for your own environment's one.

# add bridge "br0" [root@dlp ~]#  nmcli c add type bridge autoconnect yes con-name br0 ifname br0  Connection 'br0' (0f4b7bc8-8c7a-461a-bff1-d516b941a6ec) successfully added. # set IP for br0 [root@dlp ~]#  nmcli c modify br0 ipv4.addresses 10.0.0.30/24 ipv4.method manual  # set Gateway for br0 [root@dlp ~]#  nmcli c modify br0 ipv4.gateway 10.0.0.1  # set DNS for "br0" [root@dlp ~]#  nmcli c modify br0 ipv4.dns 10.0.0.1  # remove the current setting [root@dlp ~]#  nmcli c delete eno16777736  # add an interface again as a member of br0 [root@dlp ~]#  nmcli c add type bridge-slave autoconnect yes con-name eno16777736 ifname eno16777736 master br0  # stop and start NetworkManager [root@dlp ~]#  systemctl stop NetworkManager; systemctl start NetworkManager  [root@dlp ~]#  ip addr  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000 link/ether 00:0c:29:9f:9b:d3 brd ff:ff:ff:ff:ff:ff 3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default link/ether 00:0c:29:9f:9b:d3 brd ff:ff:ff:ff:ff:ff inet 10.0.0.30/24 brd 10.0.0.255 scope global br0 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe9f:9bd3/64 scope link valid_lft forever preferred_lft forever